Slim Liner Cementing Technology for Ultra-Deep Wells with a Narrow Annulus in No.1 District of Shunbei Block
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摘要:
顺北一区超深井窄间隙小尾管固井面临水泥环薄弱、注替泵压高、顶替效率低、井下温度高和高压盐水层发育等一系列技术难题，固井质量难以保证。为解决该问题，在总结前期固井施工经验的基础上，完善了井眼准备技术，优化了抗高温防气窜弹韧性水泥浆体系，开展了水泥石密封完整性研究，进行了固井流变学设计及压稳防气窜工艺优化，形成了顺北一区超深井窄间隙小尾管固井技术。该固井技术在现场应用3井次，固井质量良好，后期施工未发生水侵，保证了窄间隙段的长效密封性。顺北一区超深井窄间隙小尾管固井技术，不但解决了该区块的固井难题，还保障了该区块的安全、高效开发。
Abstract:Slim liner cementing in ultra-deep wells with narrow annulus in the No.1 District of the Shunbei Block faces a series of technical challenges such as weak cement sheath, high displacement pumping pressure, low displacement efficiency, high bottomhole temperature and the development of high-pressure brine layer, which compromises the cementing quality. In order to solve those problems, on the basis of summarizing the previous operation experiences, small liner cementing technology for ultra-deep wells with narrow annulus in the No. 1 District of the Shunbei Block was formed by improving wellbore preparation technologies, optimizing the high temperature/gas channeling-proof elastic toughness cement slurry system, conducting cement stone sealing integrity research and carrying out cementing rheology design and stable-killing gas channeling-proof optimization. It has been applied in 3 wells in this area with good cementing quality. The subsequent operations were free from water intrusion, ensuring the long-term sealing of section with a narrow annulus. This cementing technology can not only effectively solve the cementing problems of this block, but also effectively ensure the safe and efficient development of the block.
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图 1 顺北一区典型的新四级井身结构示意
Figure 1. Schematic of typical new four-level casing program in No. 1 District of Shunbei Block
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图 2 水泥石抗压强度、弹性模量与弹性材料加量的关系
Figure 2. Relationship between the compressive strength, elastic modulus and the elastic material dosage of cement stone
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图 3 有机纤维加量与水泥石抗折强度的关系
Figure 3. Relationship between the organic fiber dosage and bending strength of cement stone
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图 4 水泥环密封完整性评价装置示意
Figure 4. Schematic of the evaluation device of cement sheath seal integrity
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图 5 常规抗高温水泥浆水泥环密封试验结果
Figure 5. Test results of the sealing performance of cement sheath formed by conventional high temperature resistant cement slurry
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图 6 抗高温防气窜弹韧性水泥浆水泥环密封试验结果
Figure 6. Test results of the sealing performance of cement sheath formed by high temperature/gas channeling-proof elastic toughness cement slurry
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图 7 应用抗高温防气窜弹韧性水泥浆的3口井的声幅测井曲线
Figure 7. Acoustic logging curve of 3 wells adopting high temperature/gas channeling-proof elastic toughness cement slurry system
表 1 顺北1–14井小尾管固井浆柱结构设计结果
Table 1 Structural design results of cement slurry column in Wells 1–14 cemented with slim liner in Shunbei Block
序号 液体 液体密度/（kg·L–1） 用量/m3 长度/m 分段压力/MPa 累计压力/MPa 1 钻井液 1.65 5 467.00 88.49 88.49 2 隔离液 1.75 16.00 750.00 12.88 101.37 3 水泥浆（领浆） 1.88 12.31 783.00 14.44 115.81 4 水泥浆（尾浆） 1.90 7.74 580.00 10.81 126.62 
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表 2 顺北一区5口井三开所用钻井液密度及出水情况
Table 2 Drilling fluid density and water production in the third spud of 5 wells in No.1 District of Shunbei Block
井号 井身结构 三开钻井液
密度/（kg·L–1）出水情况 顺北1–4H 原四级 1.76 钻至井深7 253.32 m，出口密度由1.76 kg/L降至1.00 kg/L，地层出水排放污染钻井液9.947 m3，未发现液面上升 顺北1–5H 原四级 1.68 钻至井深7 401.00 m，液面无变化，出口密度由1.66 kg/L降至1.62 kg/L，地层出水排放污染钻井液26 m3 顺北1–11 新四级 1.62 钻至井深7 209.55 m，迟到井深7 205.40 m，出口密度由1.60 kg/L降至1.55 kg/L，液面无变化，判断地层出水 顺北1–13 新四级 1.63 中完通井下钻划眼到底循环，出口密度由1.63 kg/L降至1.20 kg/L，判断井下出盐水，液面无明显上升，循环排污15 m3 顺北1–14 新四级 1.65 中完通井到底，循环期间循环出的盐水及混浆总计49.79 m3，液面无明显上升
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表 3 水泥浆性能要求
Table 3 The performance of the cement slurry
水泥浆 密度/（kg·L–1） 滤失量（6.9 MPa×30 min）/mL 析水量/mL 24 h抗压强度/MPa 100 Bc稠化时间/min 流动度 六速黏度计读数 领浆 1.88 40 0 23.8 369 22 245/151/110/64/7/5 尾浆 1.91 36 0 24.1 180 21 298/216/175/138/10/6
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